Intebest-determining device



Aprxl 29, 1924. v 1,492,313

W. E. SCHILLING o INTEREST DETERMINING DEVICE Filed July 15 1922 QxM Patented Apr. 29, 1924.

v UNITED STATES E SOHILLING, OF DES MOINES, IOWA.

INTEREST-DETERMINING navrcn Application and Jul 15,1922. semino. 575,240.

To all whom it mag concern:

Be it known that I, WILLIAM E. SCHILL- nvo, a citizeno'f the United States, and a resident of Des Moines in the countyof I Polk and State of Iowa have invented a certain new and useful. nterest-Determining Device, of which the following isa specification. n a

The object ofmy invention is'to provide an interest determining deviceof very simple and inexpensive construction,[ which may be used for readily and easily determining the interest accrued atcertain rates on certain sums between certain fixed dates 1| without the necessity for determining the ela d time.

ith this and other objects; in view, my

invention consists in the. construction, arrangement and combination of the various parts of my device whereby the ob'ects contemplated are attalned, as'hereina ermore fully set forth, pointed out in my claim, and illustrated in the accompanying drawings, inwhich: Figure 1 shows a perspective view of an interest determining device embodying .my invention. i 0 0 Figure 2 shows a plan view of a portion ofmy device; and I Figure 3 shows a sectional view taken on the line 33 of Figure 2.

My improved interest determiningdevice comprises primarily an envelope or' receivp ing member indicated in the accompan 'ng 85 drawings by the reference numeral 10, av-

11 therein and a card ing a sight opening 0 1n sald recelving mem- 12 slidably mounte her and adapted to be slidto different positions telescopically therein. I

, umn of figures 11 regularly spaced apart and running consecutively fromfil at the bottom to 31? at the top, as illustrated in '46 Figure 2. These figures representthe days of themonth. a

The sight opening 11 ispreferably in the u xer half of the receiving member.

t the upper end of the receiving mem her is a thumb notch 13 for permitting the to 90,000 arranged in horizontally Adjacent to the si ht opemng 11" pref-. erably at the left han side thereof is a colrunning from, for '.instance,.. v

mem er are 't 'beu ed.

spaced columns. These columns are indicated by the reference numeral 14.

The card 12 is arranged with a series of horizontally spaced columns of figures 15,

correspondlng to the columns 14. The fig- 60 ures inthe columns 15 are spaced apart vertically, distances corresponding to the distances between the numbers on the member 10, indicating the days of the month.

At the left hand side of the card 12 beginning at the top is a column 12" of consecutively arranged figures running from $1 to 31.,,representing the days of the month and similarly paced apart. I

At the ri ht hand side of the card 12 is a column of gures running from 1 to 61 consecutively, similarly spaced apart, and running from the bottom of the card to the upper portion thereof, this column being numbered 12". I

On another card 12 the column 12" may contain figures ranging from 62 to 122 inelusive, and on similar cards the columns 12 may contain the remainder of the numerals corresponding to days in a car. The columns 15 commence on a line, such a. distance below the top of the card 12, as to allow for the space between the sight opening 11 and the to of. the receiving element10., "I provide asufiicient number of the cards 12 jandmembe'rs 10 to accomplish the purose. I Inthe form of my device shown herein, I have shown each receiving member 10 with two sight openings and'designed to be used with two cards. I I A It is obvious that the receiving member 10 can be used to receive one card only, or more thantwo, if desired. a

I preferably. provide the backs of the receiving elements with sight o enings and the backs of the cards with suitable tables, for the purpose of saving space. Each card has on it the proper tables 100 I showing the interest at a certain rate accruing between certain dates.

On the card 12, illustrated in the drawings, I have shown atableshowing interest atsix'per cent for from one to sixty-one 1 days on various amounts.

I I preferably attach to the-members 10, tabs 16 on which may beprinted the periods. for which the cards held b that receiving or instance, the 1H card 12, illustrated, may be used for any period where the interest begins to run in a month having thirty-one days and ends in the next month. Other cards may be employed for the periods beginning in months having twenty-eight or thirty or thirty one days and ending in the next or any subsequent month.

For further illustration, it may be said that the figures on the card 12 are so arranged that when the card is slipped upwardly, for instance until the 1 at the upper left-hand side of the card in the column 12 is just above the edge of the receiving member 10, then in the column of figures on the card 12 in the column corresponding to the column 14, having 10,000. there 'will appear, subject to corresponding placement of the decimal point, figures representing the interest on $1.00, $10.00 $100.00, $1000.00, $10,000.00, and so forth, from the first of the month to the respective days of the succeeding month. For instance, opposite the numeral 1 in the column of days on the receiving member 10 will "be found fi res representing the interest on $1.00, $10.00, QQ f e from the first of one month to the first of the next month.

Horizontally across in the respective columns will appear the interest on $2.00, $20.00, $200.00, $2000.00 or $20,000.00; on $3.00, $30.00, $300.00, $3000.00 or $30,000.00; on 1.00, $40.00, $400.00. $4 000.00, or $40,- 000.00; on 5.00, 50.00, 5 00.00, 5000.00, or 50,000.00; on $0.00, $00.00, 000.00, 0000.00 or 00,000.00; on 7.00, 70.00, 700.00, 7000.00 or $70,000.00; on $8.00, 30.00, $800.00, $8000.00. or $80,000 100 and on $9.00, $90.00, $900.00, $9000.00 01' $90,000.00, the decimal point being correspondingly placed.

It will be seen that by roperly pointing oil the decimals, one may t us determine the interest on any sum from $1.00 to $99,999.00, or by enlarging the tables, the interest on any amount in excess may be similarly determined. i

If for example, it is desired to find the interest on $1 532 on a note running from July 13th to August 31% he user of the device would slide the card 12 upwardly until the numeral 13 representing the day of the month when the interest be an to run, found in the col at-the leii-hand side of the sheet 12 stands abovethe edge. f e ece v ng member q (F gu e ,2)-

Then the user runs down the column of days on the receiving member 10 at the lefthand side of the sight '0 ening to the numeral 31 representing last day of the month for which interest 'lpQruesj on running the ey a os the Page o the fig on the'ca il theco11 1 1inunder$ i0; 0 t an by pr p r y pl h deic mie Pbi'ntfih he in erest cinemas newsma Jilly 13th and August 31st, the figures 'shown op osite 31 being pointed oil to read .167.

Running to the right across the columns 31 to the column headed on the receiving member 10 by 50,000 the user would similarly find the interest on $500 accrued from July 13th to August 31st to be $4.083, and this amount would be set down in a column under the $7.00.

The user would thus have determined the interest of $1500.

Going back to the column 14 under the heading 30,000, he would find in said column opposite the numeral 31 in the column of days, by properly placing the decimal pOin't, the interest for $30.00 for the period under consideration, to be $245 and place such amount under the interest already as certained.

He would then look in the column below the2 0,000 among the columns 14 at the point'opposite the numeral 31 in column 11 nd y P p y P ac ng the de a p n would find the interest on $2.00 to be $016.

By" adding up the various items of interest, the exact interest can be thus determined, the interest in the illustration on the amount of $1532, totaling $12.51.

In the column 12" o posite the 31 in the column 11- appears t e number of days elapsed between July 13 and August 31st (49 (la s 'lliis process eliminates the necessity of determining the elapsed time, which is requiredfwhere' the ordinary interest tables are used. i

It also makes possible the finding of the interest on the whole sum from one card or sheet 12 These cards may be used with tables at any rate of interest for any interval of time and the various containers 10 may be made to contain as many tables, as is desired.

I claim as my invention:

In a device of the class described, a receiving element having a si ht opening in one of itstop sides, a table 0% figures on said e ment adjacent to one of the vertical edges of the sight opening, said figures running from one at the bottomto th rty oneat the top, said figures being equally spaced apart a d epr sent g day Of t ma a umn of figures on said element arran ed ad j a'cent the horizontal upper edge of t e sight opening, said last c'o'lumn representing amounts oi principal, said sight opening bea renged i e epne a o the eiv "e eme t, a d 'of gre e le thante sight opening received in said ree v a elemen endcepa l bf idins'mov 3 tra n; a vert cal. column f fig r eni a dfi r runni g frem n he r m tl 'ir yr a th 'b t o fl; Sai law- 111mm be ng] in. s bstant al lignm n with the column of figures on the receiving element running from one to thirty-one, a

column of figures increasing successively from the bottom to the to and arranged on said card so as to be disp ayed along one edgeof the sight opening, a plurality of co umns of figures arranged vertically representing interest accrued for specified times on the amounts of principal specified in the horizontal column of figures on said receiving element, said card when moved to position artially out vof the receiving element a will ring the interest calculations to position in horizontal ali nment with the numbers alon the vertica edge of sight opening for a penod of time starting with the numher on the card just above the upper edge of the receiving element and said column of figures on the card arranged near one vertical edge of the sight opening, when aligned horizontally with any of the numbers running from one to thirty-one on the receiving element, representing the elapsed time for which the interest is calculated.

Des Moines, Iowa, June 20, 1922.

WILLIAM E. SCHILLING. 

